Life is full of surprises and Caterham tester Heikki Kovalainen certainly got one this week with a late call-up to replace Kimi Raikkonen at Lotus for the final two rounds of 2013. Kovalainen, a seasoned F1 campaigner, is taking it all in his stride and is confident of a strong result in Austin. The Finn is not, however, getting carried away and insists a return to the grid with Caterham remains his primary goal for 2014